Onset of puberty in girls has fallen by five years since 1920, Children

No one is sure what is causing the change

Physical changes in puberty

One in 25 American five-year-olds today will not make it to their

Childhood obesity 'to blame for early puberty

Physical Changes During Puberty

Puberty Starts Earlier Than It Used To. No One Knows Why. - The

Menarche - Wikipedia

PDF) Evidence from Finland and Sweden on the relationship between early-life diseases and lifetime childlessness in men and women

With puberty starting earlier than ever, doctors urge greater

Frontiers Sex-Specific Associations Between Trauma Exposure

Why Are More Children Going Through Puberty At A Younger Age? - Texas A&M Today